oppose vs struggle

oppose is not a noun while struggle is a noun.

Word	Noun	Adjective	Verb	Adverb
oppose	No	No	Yes	No
struggle	Yes	No	Yes	No

As verbs, struggle is a hypernym of oppose; that is, struggle is a word with a broader meaning than oppose:

Other hypernyms of oppose include contend, fight.

oppose (noun)	struggle (noun)
	strenuous effort
	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

oppose (verb)	struggle (verb)
be resistant to	be engaged in a fight; carry on a fight
be against; express opposition to	to exert strenuous effort against opposition
set into opposition or rivalry	climb awkwardly, as if by scrambling
fight against or resist strongly	make a strenuous or labored effort
act against or in opposition to
contrast with equal weight or force